Since Ahmad needs to read 5 novels each month, we have the following equation:
![N=5M](https://img.qammunity.org/2023/formulas/mathematics/college/tszgk0fu6u76k3n4kjw9epj8r2vdm7wfe7.png)
Now, to find the number of novels that Ahmad needs to read in 15 months, we replace M = 15 in the above equation, and we operate:
![\begin{gathered} M=15 \\ N=5M \\ N=5(15) \\ N=75 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/ddvodpbwwqjmgo1hchxitw2gt0xkohkjwx.png)
Therefore, Ahmad needs to read 75 novels in 15 months.